Apparatus for lacquer coating side seams of can bodies



R. A. LARSON APPARATUS FOR LACQUER COATING SIDE SEAMS 0F CAN BODIES 'Dec. 7, 1948.

3 Sheets-Sheet l FileduDec. 8, 1944 fiaZ viz A. Larson.

m Wm, aizzwagwm Dec. 7, 19.48. I I LARSON 2,455,785

APPARATUS FOR LACQUER COATING SIDE SEAMS OF CAN BODIES Filed Dec. 8, 1944 s Shets-Sheet 2 %m, Win /5% LARSON APPARATUS FOR LACQUER COATING SIDE SEAMS OF CAN BODIES Dec. 7, 1948.

3 Sheets-Sheet 3 Filed Dec. s, 1944 Patented Dec. 7, 1948 YAPPARATUS roe LACQUER COATING smr: SEAMS or CAN BODIES Ralph A. Larson, Chicago, 111., assignor to Conl tinental Can (lompany lnc New York, N. Y.,

a corporation of New York Application December 8, 1944, Serial No. 567,180

The invention relates to new and useful improvements in an apparatus for coating the outer face of the side seam area of a can body. It is well known that when either silver leador other high melting point low-tin content solders are used in soldering hot dipped or electro tinplate, outside side seam rusting and dis-coloration will occur more rapidly under some conditions of processing as well as when cans are in storage before and after processing, than when either the lower melting point high-tin content, tin lead sol- 1 ders are used. This more rapid rusting is due mainly to the removal from or. the disturbance of the tin coating on the tinplate at the solder cut area during the soldering and wiping, because of the lower melting point of the tin coating than the solder which is being applied thereto. 3

Anobject of the invention is to providei an apparatus for applying a protective lacquer coating to the solder cut area of the side seam of a can body as said body leaves the solder applying section of the body maker.

A further object of the invention, is to provide 1 sciaims, (Cie 15 an apparatus of the above type wherein the protective lacquer coating is applied by sprayingde vices.

vide an apparatus of the above type wherein two separate spray nozzles are utilized and are so positioned that the, coating placed on the can body; by one nozzle extends from the seam opening to the left thereof while the coating applied by the A still furtherobject of the invention isjjtopro other nozzle extends from the seam opening to I the right thereof, thus completely covering the solder cut area and the lapping of the coatings at the seam opening.

A still further object of the inventionis to 'provide an apparatus ofJthe above type wherein the solder horsejis so constructed as to prevent the accumulation of lacquer on the inside of the horse due to the spray contacting therewith between passing canbodies. v

These and other objects will in partbe obvious and will in partbe hereinaiter more Iully disclosed. l f

In the drawings: i

Figure 1 is a view partlyin transverse section and partly in elevation showing an apparatus embodying the invention as appliedto a body maker only certain essential parts of the body maker be- 1 ing shown;

Figure 2 is a side elevation of a portion or the essential features of the body maker with the improved lacquer applying apparatus applied thereto; a it v Figure 3 is a view showing more or less diagrammatically and in plan -a section of the body maker with the improved lacquer applying apparatus attached thereto and also showing the modified form ;of horseused with the lacquer applying apparatus;

Figure; is through a portion of the lacquer applying apparatus showing the reservoir for supplying lacquer to thespray nozzles;

Figure 5 is an enlarged detail of a section of the horse which guides the can bodies through the solder applying section of the body maker;

Figure 6 is a sectional view on the line 8- 6 of Figure 7 is anend view of the solder horse shown in Figure 5;

Figure 8; is a view showing more or less diagrammatically a can body having the protective lacquer coating in part applied thereto and showing the mannerin which these coatings are placed relative .to the side seam and are lapped one upon the other; V

Figure 9 isa sectional view onthe line 9-5 of Figure 8 and showing the lacquered coatings on a much enlarged scale in order to illustrate the overlapping of the coatings and the extent or the area coated thereby. s

The invention has to do with an apparatus applied to the body maker for spraying the outer surface of the can body in the region of the side seam just prior to the discharge of the can body from the solder horse associated with the can body soldering machine. The can body maker is of the usual type in which the can bodies are formed from blanks having hooks which are interlocked to form a side seam, These interlocked hooks are bumpedand thenthe can body is passed over a solder rollrotating'in a bath of solder. The solder roll extendslngthwise of the bath and the can body sideseam is guided by an outside horse so that the side seam engages the-solder coating lifted fromthe bath by the solder applying roll. This is such a common type or body making solder applying machine that it was not thought gecessary to disclosethe machine in any great The solderhorse which guidesthecan bo dy over the solderbath is formed in[ two sections;

Thetwo sections arespaced away from each other at the lowerj side so as. to expose the side seam for the application. of solder to theouter face of 1 theside seam. The upper edge portions of the,

solder horse are also spacedaway from each other so as to permit the feeddog to contact with and an enlarged transverse sectional view passing can bodies 1 thercollect andcarry away any fumes passing around or up through thehorse,

"Ihe operationbf the spraying apparatus is thoughtjto-be obvious from the detailedi description which has been given above., Ihe can bodies pass through the body, maker in. the usual manner and solderis" appliedto theouter face of the can bodyi in the region of the side seammAfter leaving the1so1der roll tlieicanbOdies are' su'bjected to a usual Wiping'roll: for removing rplus solder from the outer faceof the can bodyinthe region {of the side seam. When solder isused of highen-fnelting point than thetin coating covf ing the plate,this tin coating on the plate is sometimes removed or disturbed during the soldering and wiping of the seam. If there is any disturbance in the coating which might lead to rusting during processing or storing, this is prevented by the improved apparatus described above. Just before the can body leaves the solder horse associated with the soldering mechanism, it passes through the spraying device which sprays a coating of lacquer on the side seam area so that the entire area which might have been disturbed during the soldering and wiping of the can body is covered by this protective coating.

While the invention has been described as particularly useful in connection with the solder bonding of tin-coated plate can bodies, it will be understood that it may also be very useful in connection with the solder bonding and protecting of the side seam'area in connection with black out'any objectionable coating lodging on the iii-1 sideofztheihorse. i 1* In a can bodyrsoldering machine havingwafl horse forguidingcan bodies with theside seam exposed fortreatment, a plurality" of spraynoz- V zles, means for projecting a spray of lacquer from plate where lacquer coatings are applied to the plate in the sheet but are disposed so as to leave bare spaces in the region of the side seam to facilitate the solder bonding of the side seam without disturbing the lacquer coating which is applied to the body blank in the sheet. After leaving the solder bath the spray devices described above will spray the area of the can body between the edges of the predecorated or lacquered sheet so that the entire outer surface of the can body will be protected with a lacquer coating.

The reservoir containing the lacquer is adjustable vertically on the standard 32 and is clamped in adjusted position by plates 32a. By adjusting the reservoir the elevation of head of the liquid lacquer level can be varied and this will control the weight of the film deposited on the can bodies.

While two coating nozzles have been described, it is to be understood, of course, that a single nozzle may be used and that many changes in the details of construction and arrangement of parts may be made without departing from the spirit of the invention as set forth in the appended claims.

I claim:

1. In a can body soldering machine having a horse for guiding can bodies with the side seam exposed for treatment, a spray nozzle, means for projecting a spray of lacquer from said nozzle and means for supporting said nozzle at one side of said horse and positioning the same so that the spray jet projected from the nozzle will coat the outer face of the can body at the side of and in the region of the seam opening, said horse at the side opposite the nozzle being cut away so that the spray between passing can bodies will pass into and through the horse witheach nozzle and means for supporting said nozzles relative to said horseso that thesprays pro-: jected from said nozzles willcoat the outer faceof the canbody with separate longitudinally extending strips slightly overlapping in the regionof the seam opening. j ,1 i j .3. In a can body soldering machine, having a horse forguiding can bodies with theside seam exposed for treatment, a pair of spray nozzles, means for projectinga spray of lacquer from each nozzlegandmeans for supporting said nozzlesati oneside of the horse so that the spraysprojected from said nozzles will coat the outer face of the can body in separate longitudinally extending strips disposed at opposite sides of and overlapping in the region of the seam opening.

4. In a can body soldering machine having a horse for guiding can bodies with the side seam exposed for treatment, a pair of spray nozzles, means for projecting a spray of lacquer from each nozzle and means for supporting said nozzles at one side of the horse so that the sprays projected from said nozzles will coat the outer face of the can body in separate longitudinally extending strips disposed at opposite sides of and overlapping in the region of the seam opening, said horse being cut away at the side thereof opposite the spray nozzles so that the projected sprays between passing can bodies will pass into and through the horse without any objectionable coating lodging on the inside of the horse.

5. In a can body soldering machine having a horse for guiding can bodies with the side seam exposed for treatment at the lower side thereof, a spray nozzle disposed beneath the horse and at one side thereof, means for projecting a spray of lacquer from said nozzle, said horse at the side opposite the spray nozzle being cut away and provided with spaced guide rods for directing the can body through said cut-away section.

6. In a can body soldering machine having a horse for guiding can bodies with the side seam exposed for treatment atthe lower side thereof, a spray nozzle disposed beneath the horse and at one side thereof, means for projecting a spray of lacquer from said nozzle, said horse at the side opposite the spray nozzle being cut away and provided with spaced guide rods for directing the can body through said cut-away section and means for supporting said spray nozzle so that it may be shifted toward and from said horse for projecting a spray of lacquer onto the outer face of the can body at the sides of and in the region of the seam opening.

7. In a can body soldering machine having a horse for guiding can bodies with the side seam exposed for treatment, a spray nozzle, means for projecting a spray of lacquer from said nozzle games;

I spray, except against the icanrbodyfinrth'sregion of the seam opening and into amiuthmuglm the.

horseas. statedgianct meansxincluding; a duct for taking away-spraypassing; bhmughisairl horse:

BuaIn; aucaw body'ssoldering:machineashaving: a.

house for=guidingqcaaa bodiesa;wibh the .sideyseaim;

exposedefor :treatment: at the-lowenxside; thexzeoi. a- 5-pray.znozz1e.= disposed; beneath. the almrse and at; onezside thereoii;meansaionproiecting a spray;

bashifizeditoward and from-saidahorseior pm- 1 iecting-a: spray of; lacquervonto' the outer face.- of; the eamhody at the sidew ofiand inthenregi'on'vofe themeamopeningimeansf 01: enclosing: saidvnozzle inhama'nner for: prhvenfiing'freersdisnersiom 0f.- the sprayvexcept against: the cam body 'imth'ewregiom ofwthesea.mz.opening, 'ancliinto :zanduthmugh xthe: ho'rseas& stated; andameans including; ancdwct; for:

takingiaway spnayvpassing; :thnoug-h said: harseze RALPH A. LARSON.

REFERENCES CITED Thefollowing" references are of records maths 1 filia -of" this patent:

UNITED STATES- PATENTS Number: Name: Date; N

1926365 v Townsend; Sept..412,: 1933" 1-,960;='Z25w Bramsemet a1; May 29, 19?

2,041,765 Howell ,May'.26,- 1936:. 2,220,107- Hollowary New; 5, L940" PGQBSOIL:, -.DCC'. 15;:1942 

